i have seen sr primers used in 9x21 hot ammo for pressure protection,
but this is a different subject.
i am getting ready to do load development for 135's in a 3" 38.
several sets of data from guickload show poor powder burn/lots of unburnt powder/not efficient.
i was considering going to a sr primer, and working up from a lower starting point,
and see what happens, i have several flavors of sr primers to chose from.
anyone done this ??